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Expansion Tanks - How a Diaphragm Expansion Tank Works. When water is heated in a closed system it expands. Water is not compressible, therefore, the additional water volume created has to go someplace. When an expansion tank is installed the excess water enters the pre-pressurized tank (figure 1).
Installation itâs not difficult or complicated but you still need to follow manufacturerâs instructions. First and foremost before anything else turn off gas or electric if this is an electric water heater and cold water supply to the expansion tank. Second drain the cold line and remove the old tank. Finally pre charge the new one (if needed) before itâs under water pressure and install.